Negligible absorption, broad passband, output window for a millimetre-wave electron cyclotron maser

Abstract

A 0.127 mm thick Mylar output window was developed for the highly tunable Strathclyde University electron cyclotron maser (ECM). This had no measurable millimetre-wave absorption in the W-band (75-110 GHz) frequency range and could withstand atmospheric pressure. Even for G-band (140-220 GHz) oscillation of the ECM the Mylar window was thin enough to avoid Fabry-Perot effects.